/************************************************************************
 * Cruise - a programming language of bad actors
 * Copyright 2006 Mark C. Chu-Carroll
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, 
 * software distributed under the License is distributed on an 
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
 * either express or implied. See the License for the specific 
 * language governing permissions and limitations under the License.
 * 
 */
package cruise.interp;

import java.util.LinkedList;
import java.util.Queue;

import cruise.ast.TupleExpression;

/**
 * An abstract superclass of all primitive, builtin actors.
 *
 */
public abstract class PrimitiveActor implements IActor {


	public boolean poll() {
		return !messages.isEmpty();		
	}
	
	public abstract void processMessage() throws CruiseRuntimeException;
	
	public void enqueueMessage(TupleExpression msg) throws CruiseRuntimeException {
		if (!msg.isConcrete()) {
			throw new CruiseRuntimeException("Cannot enqueue a non-concrete message");
		}
		messages.add(msg);
	}
	
	protected Queue<TupleExpression> messages = new LinkedList<TupleExpression>();

}
